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Authors
Traag, V. A. https://orcid.org/0000-0003-3170-3879
Waltman, L.
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Article History
Received: 17 August 2018
Accepted: 30 January 2019
First Online: 12 March 2019
Competing interests
: The authors act as bibliometric consultants to CWTS B.V., which provides commercial bibliometric services.
